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diff --git a/sourcecodes/bnt-master/BNT/general/Old/compute_interface_nodes.m b/sourcecodes/bnt-master/BNT/general/Old/compute_interface_nodes.m
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+function [int, persist, transient] = compute_interface_nodes(intra, inter)
+% COMPUTE_INTERFACE_NODES Find the nodes in a DBN that represent a sufficient statistic
+% [int, persist, transient] = compute_interface_nodes(intra, inter)
+%
+% The interface nodes are all those that has an incoming temporal arc,
+% or which have a child which has an incoming temporal arc,
+% where a temporal arc means one coming from the previous slice.
+% (The parents of nodes with incoming temporal arcs are needed
+% because moralization will bring them into the clique.)
+%
+% The persisent nodes are all those that have one or more incoming temporal arc.
+% The transient nodes are all the non-persistent.
+%
+% See U. Kjaerulff, "dHugin: A computational system for dynamic
+% time-sliced Bayesian networks", Intl. J. Forecasting (11) 89-111, 1995
+
+n = length(intra);
+int = [];
+persist = [];
+for u=1:n
+  if any(inter(:,u))
+    int = [int u];
+    persist = [persist u];
+  end
+  if any(inter(:, children(intra, u)))
+    int = [int u];
+  end
+end
+int = unique(int);
+persist = unique(persist);
+transient = mysetdiff(1:n, persist);